Cultural critic Greil Marcus: Van Morrison's moments of disbelief

Colin Marshall talks to music journalist, critic, and observer of America Greil Marcus. Though they span countless subjects, Marcus’ past books have been rooted in examinations of icons like Bob Dylan, the Sex Pistols, Elvis Presley, and Bill Clinton. In his latest release, When that Rough God Goes Riding: Listening to Van Morrison, he takes on the Irish singer-songwriter’s vast, varied catalogue, documenting his own responses to Morrison’s music as well as the far-flung cultural and psychological resonances it sets off.